1. Turn OFF and disconnect scoreboard mains-power
2. Unscrew the philips-screw from one of the sides and remove the metalbar
3. Slide the acrylic frontplate to the side.

4. Locate the defective display.
5. Unscrew the 4 retaining screws and unplug cables attached to the digit.
6. Set the address dipswitch on the new digit as on the defective digit.
7. Mount the new digit using the 4 screws and plug in cables.
8. Connect mains power and turn on the power.
9. Test the scoreboard.
10. If no error occours, mount the fronts again.
11. Mount the metalbar and fasten it using the philips-screws.